Police gather on State Street in downtown Schenectady as part of their investigation of a bomb threat that was phoned into Schenectady County Community College on Tuesday, April 22, 2014. (Skip Dickstein / Times Union)

A total of three calls, the first received at about 11:55 a.m., were placed by an unidentified man who said multiple explosive devices had been planted on campus, police said. The caller said devices would detonate and urged an evacuation of campus.

The main campus of SCCC, at 78 Washington Ave. was evacuated. A satellite campus at 433 State St, was also vacated. A third site is in Albany. The college canceled day classes and police canine units were brought in.

Several business also inside 443 State St. were evacuated. The addresses were checked by police, K9s and staff. No suspicious items were found. Police cleared 443 State St. at about 1:53 p.m. and the main campus was cleared at about 3:07 p.m. State Police assisted.

There were no injuries.

Shortly before 2 p.m., the school released a statement from SCCC Board of Trustees Chairwoman Denise Murphy McGraw that read in part:

"The safety of our students and staff is always our top priority, and we are working closely with Schenectady and Albany police as they conduct their investigation," it states. "At this time, classes and activities are canceled until 6 p.m., and we advise the SCCC community to check our website (sunysccc.edu) for scheduling updates."